Fire Whirl
A fire whirl, colloquially fire devil or fire tornado, is a phenomenon in which a fire, under certain conditions depending on air temperature and currents, acquires a vertical vorticity and forms a whirl, or a tornado-like effect of a vertically oriented rotating column of air. Fire whirls may be whirlwinds separated from the flames, either within the burn area or outside it, or a vortex of flame, itself.
Fire whirl – Wikipedia, the free encyclopedia